espn :kok: That's is a Nikon eyecup for the old F501. Not avaliable in the market now.
Anyway, this eyecup is not good:
i. it is half round and thus not comfortable.
ii. it drops out easily just like the original DK-10, in fact due to the fact that it protude out, it drops more easily than the DK-10.
My advise is to think twice before getting it, of cos, provided if you can still find one now... ;p
This eyecup is ideal for D100. I like it very much personally. Anyway, I got 2 from BHphoto.com and ship via vpost so the shipping cost will not be more expensive compared to the item itself. The best thing about this eyecup is: with the half rounded shape, it won't block out the LCD. That is also the reason why I gave up the round one. Try this link and you will see it is in stock: